Microsoft has announced that Steven Sinofsky, the president of its Windows and Windows Live operations, is leaving the company.
Mr Sinofsky's departure comes just weeks after the Redmond, Washington, software company launched Windows 8, which represented a major overhaul of its ubiquitous computer operating system.
Microsoft said on Monday it has promoted company veteran Julie Larson-Green to lead all its Windows software and hardware engineering.
Tami Reller will take over responsibility for the Windows business, while retaining her posts as chief financial officer and chief marketing officer.
The company did not say why Sinofsky is leaving.